29 citations · 98 across the 21 of their papers we have counts for
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math.CT2013★ 7 cited
The weak choice principle WISC may fail in the category of sets
David Michael Roberts
The set-theoretic axiom WISC states that for every set there is a set of surjections to it cofinal in all such surjections. By constructing an unbounded topos over the category of…
math.AT2013★ 1 cited
A bigroupoid's topology (or, Topologising the homotopy bigroupoid of a space)
David Michael Roberts
The fundamental bigroupoid of a topological space is one way of capturing its homotopy 2-type. When the space is semilocally 2-connected, one can lift the construction to a bigroup…